Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7450ae3425c40e…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 20:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 35b978c0d1e49545681222c796038d1e SHA-1: 89678767ee1bb55e035816c814a89524406a2f0b SHA-256: dd7450ae3425c40ee449d1732d0bd28d2a682e327f8ebb61d38c4427980573ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to suspicious domains, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through a large number of distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=dear+woman+pdf+download PDF link annotation
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/jebokagosezimokixuz.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/lejorifa.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/tevidupikizuju.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/76905090583.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/32704584344.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/22896706397.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/nuluwedazikonutebel.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/beruve.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/12816093404.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/54243618458.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210916204816_mcwa7z.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea1bc0f4f---26420517955.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021092405494973499.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/uqla3g83eliqkkp2hcspq9o2ku/79929259461.pdfIn PDF document text
    • http://schokobrunnen.com/idata/41325214725.pdfIn PDF document text
    • https://razredna-nastava.net/files/fosepitovagalis.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/taruneliwup.pdfIn PDF document text
    • https://huanghecables.com/d/files/64935934523.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///vokavojavafiwe.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/85992251661.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nanexe.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/26053450831.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/28972435218.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/96791707691.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB186 15936 bytes
SHA-256: ed74a3cd57e0b9a5a259f0328a104f9e5290e25dfb839f3c898f954accced31f
font_01_sfnt_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 10388 bytes
SHA-256: b0b1c944df6a49d86d16df92eebe5c2310c18eab3bece7ee7160767fec8dab3d
font_02_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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